docs: def load_partition_data(self, index):
          """
          Load and return the partition with the given index.
  
          Args:
              index (int): The index of partition, that refers to the index in ``self.partitions``.
  
          Returns:
              PartitionData: A PartitionData object containing the data for the partition with the given index.
          """
  
          info = self.partitions[index]
          data = PartitionData(info)
  
          for utt_id in info.utt_ids:
              utt_data = [c._file[utt_id][:] for c in self.containers]
              data.utt_data.append(utt_data)
  
          return data